Use banned domain list from the hyperphish api

[kantenkugel]

The bot will now fetch a list of banned domains from https://api.hyperphish.com/gimme-domains and check every message against said list.

• The list is fetched on program start and every 15 minutes (default) after that
  • This is configurable through the domain_poll_frequency_min config key
• The used ban-phrase for this kind of match will be "Scam detected" and it will be logged to the action log channel.
• Ordering of the different checks will be: domains -> spam -> phrases

Other miscellaneous changes:

• Fixed the example config to now properly use the phrases key in groups
• Actually return if spam was detected. No need to fall through to group/phrase matching